/*
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
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 *  https://www.apache.org/licenses/LICENSE-2.0
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 * limitations under the License.
 *
 * Other licenses:
 * -----------------------------------------------------------------------------
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 * ASL 2.0 and offer limited warranties, support, maintenance, and commercial
 * database integrations.
 *
 * For more information, please visit: https://www.jooq.org/legal/licensing
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package org.jooq.postgres.extensions.types;

import java.io.Serializable;
import java.util.HashMap;
import java.util.Map;

import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;

/**
 * A data type representing the PostgreSQL <code>hstore</code> type.
 *
 * @author Lukas Eder
 */
public final class Hstore implements Serializable {

    private final Map<String, String> data;

    private Hstore(Map<String, String> data) {
        this.data = data == null ? new HashMap<>() : data;
    }

    @NotNull
    public final Map<String, String> data() {
        return data;
    }

    /**
     * Create a new {@link Hstore} instance from string data input.
     */
    @NotNull
    public static final Hstore valueOf(Map<String, String> data) {
        return new Hstore(data);
    }

    /**
     * Create a new {@link Hstore} instance from map data input.
     * <p>
     * This is the same as {@link #valueOf(Map)}, but it can be static imported.
     */
    @NotNull
    public static final Hstore hstore(Map<String, String> data) {
        return new Hstore(data);
    }

    /**
     * Create a new {@link Hstore} instance from string data input, or
     * <code>null</code> if the input is <code>null</code>.
     */
    @Nullable
    public static final Hstore hstoreOrNull(Map<String, String> data) {
        return data == null ? null : new Hstore(data);
    }

    @Override
    public int hashCode() {
        return data.hashCode();
    }

    @Override
    public boolean equals(Object obj) {
        if (this == obj)
            return true;
        if (obj instanceof Hstore)
            return data.equals(((Hstore) obj).data);
        return false;
    }

    @Override
    public String toString() {
        return org.postgresql.util.HStoreConverter.toString(data);
    }
}
